I am trying to search a solution for this problem, but didn't find a solution. I am getting an error while login in phpmyadmin

#1045 Cannot log in to the MySQL server
Connection for controluser as defined in your configuration failed.

I am trying to configure config-db.php and config.inc.php files reside in /etc/phpmyadmin/ directory. There i am changing $dbname and $dbpass in config-db.php as my root user and password but still can't login. After google, i get some clue and uncommented a line in config.inc.php:

/* Uncomment the following to enable logging in to passwordless accounts,
* after taking note of the associated security risks. */
$cfg['Servers'][$i]['AllowNoPassword'] = TRUE;

These things are so ridiculous, follow articles like Lamp server installation
shows step by step things and i do the same thing, but i get this error thrice times. Even i can't login in mysql through shell.
Please help me to sort out this problem and know the actual reason why this happen when i am enter password twice time while installing mysql.